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APAR status

Closed as program error.

Error description

Some old levels of FC adapter firmware had an issue where
the adapter would erroneously return an error continuously.
Normally, that would result in an I/O failure. However, there
is one case where it could cause the PCM to indefinitely
retry reading information from the LUN, causing an I/O hang
instead of an I/O failure.

Local fix

Problem summary

Some old levels of FC adapter firmware had an issue where
the adapter would erroneously return an error continuously.
Normally, that would result in an I/O failure. However, there
is one case where it could cause the PCM to indefinitely
retry reading information from the LUN, causing an I/O hang
instead of an I/O failure.

Problem conclusion

Modified the PCM to check for excessive retries when rereading
the LUN access state information.